Optical pickup device for reproducing discs of two types with di

Details Optical pickup device for reproducing discs of two types with di Optical pickup device for reproducing discs of two types with di

1997-04-25

1999-08-17

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369110, 369 4437, G11B 700

Patent

active

059403608

ABSTRACT:
Beams generated from first and second laser light sources are reflected by a beam splitter to proceed toward an optical disc. The laser beams focus onto the optical disc via a selective light-transmitting part installed in front of the optical disc and an objective lens. The selective light-transmitting part is formed by an inner circular part for transmitting only the laser beam of first wavelength and a peripheral part for transmitting only the laser beam of second wavelength. The beam having transmitted through the inner circular part forms the larger beam spot on the disc while that having transmitted through the peripheral part forms the smaller beam spot, so that double beam focuses of different sizes can be formed by a single optical pickup device.

REFERENCES:
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patent: 5483508 (1996-01-01), Miyake et al.
patent: 5526338 (1996-06-01), Hasman et al.
patent: 5636190 (1997-06-01), Choi
patent: 5646929 (1997-07-01), Choi
patent: 5696750 (1997-12-01), Katayama
patent: 5717674 (1998-02-01), Mori et al.

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